22
B
Oil leaks from vent plug
Same as A1.
Case drain back pressure must not
exceed 100 psi (690 kPa). Inspect
hydraulic system for a restriction in
the return line to the reservoir.
Oil analysis may indicate contamina-
tion has worn motor shaft and seal.
Thoroughly fl ush entire hydraulic sys-
tem and install new fi lters and oil. In-
stall new motor seal.
1. Same as A1.
2. Motor seal may be defective as
a result of high back pressure in the
motor case drain circuit or contami-
nated oil. Contamination will usually
cause the seal to wear a groove in
the motor shaft. Contact motor man-
ufacturer for repair of motor shaft.
TROUBLE
PROBABLE CAUSE
REMEDY
C
The brake will not hold a load with the
control lever in neutral
The pressure at the motor ports is
also transmitted to the brake release
pilot circuit. Inspect hydraulic circuit
for restrictions, plugged fi lters or con-
trol valves not centering.
Same as Remedy of Trouble A2.
Inspect and repair/replace.
Fill with proper oil. (See procedure on
page 46.)
1. Excessive system back pressure
acting on the brake release port.
2. Friction brake will not hold due to
worn or damaged brake discs.
3. Overrunning clutch damaged.
4. Improper gear oil.
D
The hoist will not hoist the rated load Reinforce mounting surface.
If necessary, use shim stock to level
winch. Refer to “Winch Installation”.
First loosen, then evenly retighten all
winch mounting bolts to recommend-
ed torque.
Check relief pressure as follows:
1. Install an accurate 0-3000 psi
(20,700 kPa) gauge into the reel-in
port.
2. Apply a stall pull load on the winch
while monitoring pressure.
3. Compare gauge reading to winch
specifi cations. Adjust relief valve as
required.
NOTE: If pressure does not increase
in proportion to adjustment, relief
valve may be contaminated or worn
out. In either case, the relief valve
may require disassembly or replace-
ment.
1. The winch may be mounted in
an uneven or fl exible surface which
causes distortion of the winch and
binding of the gear train. Binding in
the gear train will absorb horsepow-
er needed to winch the rated load
and cause heat.
2. System relief valve may be set
too low. Relief valve needs adjust-
ment or repair.
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